Does anyone know of an application (computer or mobile) that would force you to write in order to unlock your device/log into your username?

I'd like to see some options such as, "Unlock after 250, 500, 1000 words have been completed." It would be a great way to force me to write before I could log onto to something that could so easily distract me. The file would save as a .txt file to a folder of the user's choosing.

If anyone knows of this, please link me. If not and you're interested, feel free to use the develop the idea if you're in need of a new project.